Lets try these two steps first as a test.
To open Disk Utility, from the Applications folder, open Utilities, and then double-click the Disk Utility icon.
In the column on the left, click your startup disk.
Click the First Aid tab, and then click Repair Disk Permissions. Disk Utility will reset any files and folders with incorrect settings.
Go to the link below
Click to download the Mozilla Firefox setup file.
Once downloaded, run the file to install Mozilla.
When it asks, you don't have to import anything, or make it your default browser.
Once installed, run Mozilla Firefox.
Using mozilla firefox.. try the website again.. Is it working now Martha?
A note about how we work.. It may only take one solution to solve this, it may take several. I will stick with you till this is resolved. No matter how many attempts it takes, you will only be charged once, unless you start a new question. Also, please save your feedback till the end of the process.
If my answer helped, please click one of the smiley faces to rate the solution, and then click the submit button to accept the answer..
If my answer did not work, please wait to rate the answer and also wait to submit your rating and instead send me a reply so that I can continue to assist you as needed.